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选择性吸附氧气从潮湿的空气在一个金属有机框架与三角形金字塔铜

Kurtis M Carsch^1,2, Adrian J Huang^1,2, Matthew N Dods^1,3

¹Institute for Decarbonization Materials, University of California, Berkeley, Berkeley, California 94720, United States.

Journal of the American Chemical Society

|January 26, 2024

概括

一个新的金属有机框架,CuI-MFU-4l,在室温下有效地捕获和分离高纯度的氧气,即使在潮湿的条件下. 这种材料为传统的空气分离方法提供了有前途的,节能的替代方案.

科学领域:

材料科学
化学工程
分离科学

背景情况:

工业氧气生产在很大程度上依赖于能源密集的冷空气蒸.
现有的氧气分离金属有机框架通常需要低温,对水很敏感.
需要高效的环境温度材料从空气中选择性捕获氧气.

研究的目的:

调查CuI-MFU-4l金属有机框架用于可逆捕获和从空气中分离氧.
优化CuI-MFU-4l的合成以提高氧结合能力.
评估材料在环境条件下的性能,包括湿度和重复循环.

主要方法:

优化了CuI-MFU-4l框架的合成,以最大限度地协调不和CuI位点.
在使用空气的动态突破条件下进行气体吸附和脱附实验.
用光谱 (UV-Vis,EPR),磁性和计算分析来阐明氧结合机制.

主要成果:

在环境温度 (25°C) 和相对湿度高 (高达100%) 的情况下,CuI-MFU-4l显示可逆的氧气吸收.
该材料在多个吸附-脱附周期中保持一致的氧气容量.
在温和的再生条件下,由于不同的O2和N2脱吸动力学,高纯度的氧气 (> 99%) 被分离出来.

结论:

CuI-MFU-4l 是一种非常有前途的材料,可以在没有先前除湿的情况下选择性地从环境空气中分离氧气.
该材料在潮湿条件下和室温下有效运行,与现有技术相比,具有显著的优势.
这项研究揭示了通过O2与CuI结合而形成的超氧化铜,其结合方式取决于温度.

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